668127599 has 4 divisors (see below), whose sum is σ = 674257320. Its totient is φ = 661997880.

The previous prime is 668127587. The next prime is 668127631. The reversal of 668127599 is 995721866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 668127599 - 2¹⁶ = 668062063 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 668127599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668127199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3064697 + ... + 3064914.

It is an arithmetic number, because the mean of its divisors is an integer number (168564330).

Almost surely, 2^668127599 is an apocalyptic number.

668127599 is a deficient number, since it is larger than the sum of its proper divisors (6129721).

668127599 is a wasteful number, since it uses less digits than its factorization.

668127599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6129720.

The product of its digits is 1632960, while the sum is 53.

The square root of 668127599 is about 25848.1643255377. The cubic root of 668127599 is about 874.2181201505.

The spelling of 668127599 in words is "six hundred sixty-eight million, one hundred twenty-seven thousand, five hundred ninety-nine".